(AREA) -- When it comes to new and inexperienced drivers, nighttime and after school are the most dangerous time of day for traffic crashes nationally and in Michigan. According to Michigan crash data, nearly 30 percent of crashes involving drivers age 16-20 occur in the after-school hours. More than 15,000 people were involved in a crash with a teen driver from 3-6 p.m. in 2012. The highest numbers of fatal crashes involving teen drivers happen between 9 p.m. and midnight. In 2012, 34 people were killed including 11 drivers who were 16-20 years old. This week is National Teen Driver Safety Week, which encourages parents and teens to talk about reducing common crash risks by limiting the number of passengers, putting away cell phones, obeying traffic laws and wearing a seat belt. Teen drivers with Level 1 or Level 2 licenses under the Graduated Driver License program are prohibited from using a cell phone while driving. Teens with a Level 2 license also have enhanced driving restrictions after 10 p.m. Established in 2007, National Teen Driver Safety Week is an effort to raise awareness of teen driver safety and encourage safe teen driver and passenger behavior.